The correct statement about the first transition series is:

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Atomic radii trend in first transition series (Sc to Zn):

As we move from Sc to Zn:
- Nuclear charge increases by 1 each step
- Electrons are added to the inner 3d subshell
- 3d electrons provide poor shielding
- Net effect: effective nuclear charge increases → atomic radius generally decreases

However, the decrease is not uniform:
- Slight increase at Mn (half-filled , extra electron repulsion)
- Slight increase at Zn (, complete filling)

Overall trend: generally decrease from Sc to Zn ✓

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